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I have corrected the CSS bom problem I believe ( I am using Expression Web) and corrected for most part the code errors....except there are still 2 errors coming up on the search image submit button, complaining about the width and height....I have fixed this in the code for sometimes Expression Web is quirky as hell and the server wont update the code for awhile in the browser. But I dont think these errors would cause the dropdown not to work, in my experience.

Not sure about that because I can't enable javascript but I think that you should set left to 0 (for ie6)
in .alert and #nav li:hover ul#tother-ul (rather than auto)
You may also have to set top in #nav li:hover ul#tother-ul

IE doesn't like left and right specified at the same time on absolute elements. There are also some other bugs triggered with the methods you were using and the easiest way was to set the final anchor to absolute as it cured a bug with the width. It should make no difference to the appearance.